rearend codes

[hywman]

Anyone out there know the code #s on the glove box to see whatsize rearend is in my wifes 2002 trailblazer LTZ ? Thanks

[mcali17]

Here are two of the RPO codes. If you can't find either one of them, then my guess would be that the rear end in your wife's Trailblazer is the 3.42, which I am sure is the most common.

 

GT4

Axle Rear 3.73 Ratio (DUP With 5 x 1)

 

GT5

Axle Rear 4.10 Ratio (DUP With GT8)

[hywman]

Thanks 4 the info mcali17 appreciate your time.